CN109206961A - A kind of graphene conductive heat-conductive coating and preparation method thereof - Google Patents
A kind of graphene conductive heat-conductive coating and preparation method thereof Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/1687—Use of special additives
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
Abstract
The invention discloses a kind of graphene conductive heat-conductive coatings and preparation method thereof, it is characterised in that: it is made of the component of following parts by weight: 1~10 part of graphene, 2~5 parts of carbon nanotube, 2~5 parts of sodium metasilicate, 1~3 part of urushoil, 1~3 part of tung oil, 0.3~1.5 part of cis-butenedioic anhydride, 3~5 parts of dispersing agent, 1~3 part of acrylic resin, 0.05~0.5 part of composite drier, 1~3 part of coupling agent, 0.2~1 part of silica, 0.2~1 part of composite assistant, 0.5~2 part of modified cellulose, 1.5~2 parts of zeolite powder, 1~8 part of heat-conducting metal powder, 40~60 parts of ethyl alcohol.The present invention also provides the methods of preparation above-mentioned coating.Graphene conductive heat-conductive coating is prepared in resulting coating after spraying, printing, and can be applied to the fields such as semiconductor material and conduction, heat-conductive composite material, has stronger application value.
Description
Technical field
The present invention relates to field of material technology, and in particular to a kind of graphene conductive heat-conductive coating and preparation method thereof.
Background technique
Coating be it is a kind of with different construction technologies be coated in object surface, formed adherency securely, have some strength, even
Continuous solid film.The film common name film formed in this way, also known as paint film or coating." coating have defencive function, decoration functions with
And other basic functions.With the development of the times, also higher and higher to the requirement of coating.With in global range to environmental problem
With the pay attention to day by day of energy problem, traditional coating can no longer meet the demand of reality, environment-friendly coating and multi-functional painting
Material is the direction that development is made great efforts in current countries in the world.
Conductive and heat-conductive coating is the high speed development recently as coatings industry and modern industry and a kind of function of occurring
Material refers to and is applied on non-conductive or thermally conductive ground, with the coating of certain conduction electric current and dissipation electrostatic charge, at
Film base material is usually to insulate.In order to make coating have conductive, heating conduction, common method is that conductive, conductive particles are added.
Conductive, heat-conductive coating all has important practical value in electronics industry, auto industry etc..
Graphene (Graphene) is that single layer of carbon atom accumulates the honeycomb two dimensional crystal to be formed in the form of Sp2.Graphene
With big specific surface area and excellent electricity, calorifics and mechanical property.Three-dimensional grapheme is logical based on two-dimensional graphene film
The tridimensional network that space is cross-linked to form is crossed, other than the proper property with two-dimensional graphene, three-dimensional graphite is led in space
Heat, conductive and magnanimity high quality preparation aspect have unique advantage.For example, grapheme material has unique two-dimension phonon
Transmission characteristic, high theoretical thermal conductivity (up to 5150W/m K), are the highest materials of current thermal coefficient, while graphene
With highest electronics conduction of velocity, about the 1/300 of the light velocity, and the hardness of graphene is big, up to 500 times of steel.
The structure of graphene is highly stable, and the connection between carbon atom inside graphene is very flexible, when apply external force in
When graphene, carbon atom face meeting bending deformation, so that carbon atom need not be rearranged to adapt to external force, this stable lattice knot
Structure makes graphene have extraordinary flexibility on the basis of proof strength, so that the coating after film forming is in the work by external force
Under, it is not susceptible to damaged and rupture, in addition, this stable lattice structure also makes graphene have outstanding thermal conductivity.This
The advantages of invention is using graphene, planar strength, thermal conductivity and electric conductivity after improving coating film forming, thus as soon as possible will be hot
Amount is transmitted and is distributed, and radiating and cooling purpose is reached.The excellent performance of graphene can also improve coating in the attached of matrix surface
Put forth effort, increase adhesion strength, not only reduce the pre-treatment work to matrix, and improves and use the longevity after coating film forming
Life.
Although also have at present graphene adding the precedent that other effective ingredients prepare functional coating, it is prepared into
Coating property tend not to fully meet demand, if adhesion strength is low, hydrophobicity is poor, anti-corrosion and anti-pollution are low, bad dispersibility,
And graphene is expensive, is not applied for the demand of large-scale industrial production.Therefore, develop a kind of graphene dosage compared with
It is few, but the same coating products with excellent heat conductivity conductive effect and mechanical strength, realize pushing away for graphene composite functional coating
Wide application is just particularly important.
In number of patent application 201610692038.9, a kind of graphene composite rubber material of thermal conductivity is disclosed
And preparation method thereof, with nitrile rubber, organic siliconresin, acrylic resin, sepiolite powder, cumyl peroxide, gelatin, hard
Resin acid barium, Brij phosphate, graphene, conductive black, silane coupling agent, divides diisononyl phthalate
Powder, anti-aging agent are raw material, the techniques such as cooperation grinding, spray drying, acidification, mixing, ultrasound, extrusion, stretching, thermal finalization.
In number of patent application 201410422381.2, patent discloses a kind of conductive and heat-conductive graphene slurry and painting
Material;Including conductive and heat-conductive graphene slurry (by 3~20wt% of graphene, 0~80wt% of base solvent and base resin 0~
80wt% composition) 0.1~90wt%, 0~60wt% of filler, 0~10wt% of dispersing agent, 10~60wt% of resin, curing agent 10
~60wt%, 30~70wt% of solvent.
In number of patent application: in CN201510873045.4, disclosing a kind of thermal conductivity composite material of containing graphene
And its preparation method and application, belong to new material and its applied technical field.By thermally conductive the leading of silver powder etc. and graphene mixing
Electric filler is uniformly mixed with organic elastomeric polymers materials such as vinyl silicone oils, passes through the large particle size fillers such as silver powder and high thermal conductivity
Conductive graphene synergistic effect, constructs more more smooth thermal conductivity networks, to obtain in organic polymer matrix
With excellent heat conducting electric conductivity, favorable elasticity and organic polymer composite flexible.The composite material preparation process
Simply, thermal conductivity is up to 12W/mK, conductivity up to 500S/m, electromagnetic shielding performance up to 45dB, have good elasticity and
Compressibility energy can fill hot interfacial gap well.This composite material can be used as a kind of high performance heat-conducting interface material or
Thermal conductivity high molecular material or electromagnetic shielding material use.
The patent No.: having disclosed a kind of graphene foam preparation method of thermal conductivity in CN201610054219.9, will
Wet process preparation under the action of reducing agent of graphene oxide and additive forms, and the additive is high polymer long chain fiber, is adopted
With preparation method of the invention, obtained graphene foam, thermal conductivity is excellent, and thermal conductivity reaches 150W/m*k or more,
Electric conductivity reaches 5*105S/m, and graphite foam resilience is good, single structure, and performance is uniform and stable.
A kind of graphene conductive coating and preparation method thereof is disclosed in 201410771988 .1 of number of patent application, it is described
Graphene conductive coating is grouped as by each group of following parts by weight: 0.01~10 part of graphene, 1~30 part of alcohol-soluble coating, dilute
Release 20~50 parts of agent, 0.5~5 part of dispersing agent, 0.5~5 part of stabilizer, 0.1~1 part of defoaming agent.The present invention is to lead with graphene
Electric component, alcohol-soluble coating are film forming matter, and other auxiliary agents are added, by milling, sonic oscillation and membrane filtration process prepare it is equal
The conductive coating of one system.It is easy to be mass produced, is expected to be widely applied to mobile phone, flat-panel monitor, solar battery, transparent
The fields such as the thermally conductive glass of electromagnetic wave shielding, automotive window.
Generally existing coating electrical and thermal conductivity is lower in the present invention as stated above, durability is poor, service life is lower, system is easy
Layering, cannot keep stable homogeneous to exist for a long time, mechanical performance, adhesion strength, hydrophobicity, anti-corrosion and the anti-pollution of coating,
And coating film forming after and matrix combination effect it is less desirable, it is difficult to industrialization.
Summary of the invention
The purpose of the invention is to overcome, the binding performance of current coating and matrix is poor, service life is lower, leads
The hot lower problem of conductance provides a kind of graphene conductive heat-conductive coating and preparation method thereof.Pass through graphene and other groups
Point compounding, greatly improve electrical and thermal conductivity, adhesion strength, hydrophobicity, anti-corrosion and the anti-pollution of coating, and coating at
After film and the combination effect of matrix is preferable.
A kind of graphene conductive heat-conductive coating and preparation method thereof, the graphene conductive heat-conductive coating is by following parts by weight
Each group be grouped as: 1~10 part of graphene, 2~5 parts of carbon nanotube, 2~5 parts of sodium metasilicate, 1~3 part of urushoil, 1~3 part of tung oil,
0.3~1.5 part of cis-butenedioic anhydride, 3~5 parts of dispersing agent, 1~3 part of acrylic resin, 0.05~0.5 part of composite drier, coupling agent 1~3
Part, 0.2~1 part of silica, 0.2~1 part of composite assistant, 0.5~2 part of modified cellulose, 1.5~2 parts of zeolite powder, thermally conductive gold
Belong to 1~8 part of powder, 40~60 parts of ethyl alcohol.
It is a further object to provide a kind of preparation methods of graphene heat-conductive coating.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
A kind of graphene conductive heat-conductive coating preparation method, specifically includes the following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and are heated to 65 DEG C~75 DEG C, 500~1000r/min stirs
Mix uniformly, 20~40min of time, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 20~30min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 10~20min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stir 20~120 min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed and grinds 10~20min, after grinding
Up to a kind of graphene conductive heat-conductive coating.
Preferably, carbon nanotube of the present invention is single-layer or multi-layer carbon nanotube, thickness range is 1~100nm.
Preferably, dispersing agent of the present invention is that sodium lignin sulfonate, lauryl sodium sulfate, polyoxyethylene are poly-
One or more of oxypropylene block copolymer arbitrarily compares mixture.
Preferably, composite drier of the present invention is cobalt drier, a kind of or several in zinc drier, manganese drier
Kind arbitrarily compares mixture.
Preferably, coupling agent of the present invention is one of silane coupling agent, titanate coupling agent.
Preferably, composite assistant of the present invention is ethylene glycol, in 1,2-PD, 1,3-PD, glycerine
One kind.
Preferably, modified cellulose of the present invention is lignocellulosic, hydroxypropyl methyl cellulose, carboxymethyl fibre
Tie up one of plain sodium.
Preferably, heat-conducting metal powder of the present invention is one of silver powder, copper powder and aluminium powder, and granularity be 1~
20 μm, metal powder improves electric conductivity, thermal conductivity and the intensity after coating film forming.
Preferably, urushoil of the present invention is obtained for the kernel after the separation of lacquer tree seed peel core using physics cold-press.
Preferably, tung oil of the present invention is boiled wood oil.
Preferably, ethyl alcohol mass percent concentration of the present invention is 60%~80%.
Compared with prior art, the present invention beneficial effect is:
(1) preferable electrical and thermal conductivity;
(2) preferable film strength;
(3) with the higher bond strength of matrix;
(4) preferable wearability and microhardness;
(5) corrosion resistance is good;
(6) chemical-resistance;
(7) high temperature resistance;
(8) solidification is quick;
(9) stable system, not stratified;
(10) glossiness is good.
The mixture of modified cellulose, urushoil and tung oil is added in the present invention in coating, nano-graphene can be prevented to exist
Reunite in solution, and can be avoided and the bad and conductive, heat conduction network of graphene sheet layer overlap joint occur and form incomplete defect, into
And improve the electric conductivity and heating property of product.Compared with prior art, the present invention there is preferable electrical and thermal conductivity, preferably
Film strength, with the higher bond strength of matrix, corrosion resistance is good, high temperature resistant, solidification quickly, rustless property is preferable.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation.
Embodiment 1
Graphene conductive heat-conductive coating described in the present embodiment is grouped as by each group of following parts by weight: 1 part of graphene, carbon nanotube
2 parts, 2 parts of sodium metasilicate, 1 part of urushoil, 1 part of tung oil, 0.3 part of cis-butenedioic anhydride, 3 parts of dispersing agent sodium lignin sulfonate, 1 part of acrylic resin,
0.05 part of cobalt drier, 1 part of silane coupling agent, 0.2 part of silica, 0.2 part of composite assistant ethylene glycol, lignocellulosic 0.5
Part, 1.5 parts of zeolite powder, 1 part of heat-conducting metal silver powder, 40 parts of 60% ethyl alcohol.
A kind of graphene conductive heat-conductive coating preparation method, specifically includes the following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and be heated to 65 DEG C, 500r/min stir evenly, the time
20min, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 20min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 10min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stirred stand-by after 20 min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed grinding 10min, after grinding to obtain the final product
A kind of graphene conductive heat-conductive coating.
Embodiment 2
Graphene conductive heat-conductive coating described in the present embodiment is grouped as by each group of following parts by weight: 10 parts of graphene, carbon nanometer
5 parts of pipe, 5 parts of sodium metasilicate, 3 parts of urushoil, 3 parts of tung oil, 1.5 parts of cis-butenedioic anhydride, 5 parts of dispersing agent lauryl sodium sulfate, acrylic resin 3
Part, 0.5 part of zinc drier, 3 parts of titanate coupling agent, silica 1 part, 1 part of composite assistant 1,2- propylene glycol, hydroxypropyl methyl
2 parts of cellulose, 2 parts of zeolite powder, 8 parts of heat-conducting metal copper powder, 60 parts of 80% ethyl alcohol.
A kind of graphene conductive heat-conductive coating preparation method, specifically includes the following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and be heated to 75 DEG C, 1000r/min stir evenly, the time
40min, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 30min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 20min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stirred stand-by after 120 min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed grinding 20min, after grinding to obtain the final product
A kind of graphene conductive heat-conductive coating.
Embodiment 3
Graphene conductive heat-conductive coating described in the present embodiment is grouped as by each group of following parts by weight: 5 parts of graphene, carbon nanotube
3 parts, 3 parts of sodium metasilicate, 2 parts of urushoil, 2 parts of tung oil, 1 part of cis-butenedioic anhydride, dispersing agent (sodium lignin sulfonate, lauryl sodium sulfate, quality
Than 3:1) 4 parts, it is 2 parts of acrylic resin, 0.2 part of composite drier (cobalt drier, zinc drier, mass ratio 1:1), silane coupled
2 parts of agent, 0.6 part of silica, 0.6 part of composite assistant 1,3- propylene glycol, 1.3 parts of sodium carboxymethylcellulose, 1.8 parts of zeolite powder,
4 parts of heat-conducting metal aluminium powder, 50 parts of 70% ethyl alcohol.
A kind of graphene conductive heat-conductive coating preparation method, specifically includes the following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and be heated to 70 DEG C, 8000r/min stir evenly, the time
30min, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 25min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 15min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stirred stand-by after 70min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed grinding 15min, after grinding to obtain the final product
A kind of graphene conductive heat-conductive coating.
Embodiment 4
Graphene conductive heat-conductive coating described in the present embodiment is grouped as by each group of following parts by weight: 8 parts of graphene, carbon nanotube
3 parts, 3 parts of sodium metasilicate, 1 part of urushoil, 2 parts of tung oil, 0.6 part of cis-butenedioic anhydride, 4 parts of dispersing agent polyoxyethylene polyoxypropylene block copolymer,
3 parts of acrylic resin, 0.15 part of manganese drier, 3 parts of titanate coupling agent, 0.5 part of silica, composite assistant glycerine 0.7
Part, 1.5 parts of lignocellulosic, 1.8 parts of zeolite powder, 5 parts of heat-conducting metal silver powder, 55 parts of 70% ethyl alcohol.
A kind of graphene conductive heat-conductive coating preparation method, specifically includes the following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and be heated to 65 DEG C, 600r/min stir evenly, the time
26min, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 28min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 15min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stirred stand-by after 80min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed grinding 15min, after grinding to obtain the final product
A kind of graphene conductive heat-conductive coating.
The performance test of various graphene conductive heat-conductive coating coatings is as follows in specific embodiment:
Table 1
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to be said using the present invention
Equivalent structure or equivalent flow shift made by bright book content is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (8)
1. a kind of graphene conductive heat-conductive coating and preparation method thereof, the graphene conductive heat-conductive coating is by following parts by weight
Each group is grouped as: 1~10 part of graphene, 2~5 parts of carbon nanotube, 2~5 parts of sodium metasilicate, 1~3 part of urushoil, 1~3 part of tung oil, suitable
0.3~1.5 part of acid anhydride, 3~5 parts of dispersing agent, 1~3 part of acrylic resin, 0.05~0.5 part of composite drier, coupling agent 1~3
Part, 0.2~1 part of silica, 0.2~1 part of composite assistant, 0.5~2 part of modified cellulose, 1.5~2 parts of zeolite powder, thermally conductive gold
Belong to 1~8 part of powder, 40~60 parts of ethyl alcohol.
2. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: point
Powder is one or more of sodium lignin sulfonate, lauryl sodium sulfate, polyoxyethylene polyoxypropylene block copolymer
Arbitrarily compare mixture.
3. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: multiple
Conjunction drier is cobalt drier, zinc drier, one or more of in manganese drier arbitrarily compares mixture.
4. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: even
Connection agent is one of silane coupling agent, titanate coupling agent.
5. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: multiple
Conjunction auxiliary agent is one of ethylene glycol, 1,2- propylene glycol, 1,3- propylene glycol, glycerine.
6. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: change
Property cellulose be one of lignocellulosic, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose.
7. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that: lead
Thermometal powder is one of silver powder, copper powder and aluminium powder.
8. a kind of graphene conductive heat-conductive coating described according to claim 1 and preparation method thereof, it is characterised in that packet
Include following steps:
(1) urushoil, tung oil, cis-butenedioic anhydride, acrylic resin are separately added into and are heated to 65 DEG C~75 DEG C, 500~1000r/min stirs
Mix uniformly, 20~40min of time, after keep the temperature it is spare;
(2) by graphene, carbon nanotube, sodium metasilicate, dispersing agent, zeolite powder and heat-conducting metal powder, after mixing in ball mill
On mill 20~30min, obtain powder 1;
(3) ethyl alcohol, composite drier, silica and modified cellulose are added in the powder 1 obtained by step 2, through receiving after mixing
Rice sand mill handles 10~20min, obtains powder 2;
(4) powder 2 is added in the mixture of step 1), adds composite assistant and coupling agent, stir 20~120 min;
(5) mixture obtained in step 4) is poured into high speed dispersion grinder high speed and grinds 10~20min, after grinding
Up to a kind of graphene conductive heat-conductive coating.
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CN112175462A (en) * | 2020-08-25 | 2021-01-05 | 佛山创研环保科技有限公司 | Conductive hydrophobic and oleophobic coating, preparation method thereof and cleaning-free oil fume purifier |
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CN116496632B (en) * | 2023-04-07 | 2024-02-13 | 深圳力越新材料有限公司 | Graphite aluminum composite heat dissipation material and preparation method thereof |
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